luftdichte

Luftdichte refers to the airtightness of a building envelope, meaning the degree to which uncontrolled air leakage is prevented. This is crucial for energy efficiency, occupant comfort, and the durability of the building structure. Uncontrolled air leakage can lead to significant heat loss in winter and heat gain in summer, increasing the demand on heating and cooling systems and thus raising energy costs.

A well-sealed building envelope also contributes to improved indoor air quality by preventing the ingress of pollutants, allergens, and moisture from the outside. Moisture entering the building structure through air leaks can lead to condensation, mold growth, and material degradation, compromising the long-term health and structural integrity of the building.

The measurement of luftdichte is typically performed using a blower door test. This test depressurizes or overpressurizes the building and measures the amount of air that needs to be supplied to maintain that pressure difference. The result is usually expressed as air changes per hour (ACH) at a specific pressure, or as an air permeability value. Building codes and standards often specify maximum allowable air leakage rates for new constructions.

Achieving good luftdichte involves careful design and construction practices, including the proper installation of air barriers, sealing of joints and penetrations, and the use of high-quality building materials. While complete airtightness is difficult to achieve and may not be desirable for ventilation purposes, a high degree of luftdichte is a key characteristic of modern, energy-efficient buildings.